In connection with hipot testers of the HVA series, devices of the TD series by **b2hv** can create systems for **tangent delta measurement.**

- TD30 tan delta test system
- TD60 / TD60-MC tan delta testing
- TD90 / TD90-MC tan delta testing
- TD120-MC tan delta diagnostics

As a simple and highly effective method to assess the **dielectric condition** of medium voltage cables, tangent delta measurement is the method to detect **treeing in the insulation**.

While partial discharge measurement is suitable for detecting electrical trees, tangent delta measurement – also referred to as dissipation factor measurement – detects **water trees** which have formed in the insulation of the device under test.

The data collected is compared to measurement values from the same cable taken during the acceptance test. That allows **classification **of the dielectric condition (new, strongly aged, faulty) of the cable.

The weight-optimized cable diagnostics systems are compact and designed for **mobile use**.

As with VLF cable testing a sinusoidal 0.1 Hz VLF (very low frequency) **AC test voltage** is used.

To measure the dissipation factor tan δ, voltages up to **twice the nominal voltage** (2.0 U0) are required.

Therefore, there are two models in the TD series offering 2 voltage ranges - **33 kV peak and 62 kV peak.**

These ultra precise cable diagnosis systems measure the dissipation factor with an **accuracy** of **± 10-⁴** for loads in the range of **15 nF to 5 μF.**

Tangent delta measurement is compatible with medium voltage cables with various insulation types, such

- XLPE
- PE
- EPR
- PILC

Furthermore capacitors, switchgear, transformers and rotating machines can be tested.

The PC-based software-tool **TD Control Center** offers functions for analysis, storage and display of the measurement process.

During the tangent delta measurement, **output voltage and current** are transferred in **real time** to the PC-software via the Bluetooth™ interface.

The tangent delta graph shows measurement values of the dissipation factor tan δ with respect to the selected output voltage test points.

During the test procedure, a **diagnosis report** containing all measurement values is created, suitable for storage or direct printing.

Just like the hipot testers of the HVA series

- HVA34 hipot tester
- HVA30-5 high voltage tester
- HVA60 AC hipot
- HVA90 insulation tester
- HVA94 cable tester

the diagnostic systems of the TD series are **simple and intuitive** in its use.

Therefore the test engineer is capable of performing tangent delta measurement without extensive training.

b2 high voltage offers tangent delta measurement also as an** integrated function**. The HVA28 TD VLF high voltage test set unites **VLF cable testing** and **tangent delta measurement** in one device.